Gangue particles can be removed from cassiterite ore by the process of _______.

calcination

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magnetic separation

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gravity separation

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roasting

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Solution

The correct option is B
magnetic separation

Electromagnetic separation is used to separate magnetic ore particles from non-magnetic impurities (or vice versa), wherein electromagnets present in the rotor attracts magnetic ores and forms a separate heap than the impurities. Tin stone (also known as Cassiterite) contains $S n O_{2}$ (non-magnetic) and Wolframite, $F e W O_{4}$ (magnetic) and is concentrated by this method.

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